Issue with Editing elements after upgrading WP, X and all plugins

I have cloned my site to a staging URL to update the site and have updated WP, X theme and all plugins. Now I am having issues with editing Elements in Cornerstone. When I click on an element to edit I am getting a spinning loading sign but nothing loads. I have disabled all plugins except for cornerstone and enabled twenty-twenty theme to see if something there was causing an issue but it is still not working.

I am on a VPS with hostinger if that helps

Hello @justpixelsau,

Thanks for writing to us.

We now use the WordPress Rest API for saving and it looks like your web host does not support it just because the builder is not working properly. Please ask your web host to support WordPress Rest API or whitelist the URL in the following screenshot.

Hope that helps.
Thanks

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